Family camping, a Bio major at Carleton College, nuclear medicine research in Houston, and an M.A. in Biology from Rice University introduced me to the world of life. Twenty years of teaching biology and anatomy/physiology, international travel, and curriculum work with raptors, Lake Superior, whales, prairies, medicine, neuroscience, and marine aquariums confirmed my passion for all things biological. Newly retired from teaching, I appreciate this opportunity to work in CK-12's innovative arena of biology education.

My educational background includes a PhD in physics and a Master of Science in physics and mathematics. I have been teaching physics, mathematics and astronomy for over 20 years at several colleges and private schools in different states. I currently live with my wife and boy (3.5 years) in Alexandria, VA.

Dale Baker started her academic career studying anthropology and archaeology, but later took up work as a substitute teacher while pondering her future. This was a fortuitous decision because she discovered that when students were presented with engaging science activities, they were motivated to learn. She earned an EdD in science education from Rutgers University. Dale is a full professor at Arizona State University, where she teaches courses on research design, equity and assessment issues in science education, and courses that help teachers infuse engineering concepts into their curriculum.

Stacy Baker is a biology teacher in the Northeast. She is a pioneer in the use of online mediums such as blogging for science education. She has won awards for both her classroom teaching and online outreach. Her work has been presented at the Sigma Xi Research Center, the New York Academy of Sciences, and numerous science education conferences. She received her B.S. in Zoology at Washington State University.

John Belcher holds a BS in Applied Mathematics from Brown University, an EdM from the Harvard Graduate School of Education, and an MA in Mathematics from Boston University. He is a co-developer of the Algebra Project’s African Drums and Ratios Curriculum and served as a co-coordinator of the program for approximately 6 years. John has taught elementary and secondary school mathematics and has worked as a coach/staff developer for middle and high school mathematics teachers. In addition to his background in mathematics and mathematics education, John has worked for over 30 years as a drummer/composer in a diverse range of performance, therapeutic, and cultural settings. One of John’s areas of specialty is investigating relationships between music and mathematics. His recording, The Sound According to John, on the Innova label, includes compositions based upon mathematics structures. John is a member and co-founder of the Dougouto Nganya Percussion Ensemble, a group comprised of drummers from Ghana, Mali, Senegal, and the United States. In 2004, John co-founded CrossPulse Consultants, an organization which aims to produce "fierce" (fearless and powerful) African American mathematics, science, and technology learners and to increase the numbers of individuals from undeserved populations who will go on to pursue higher education in mathematics, science, engineering and/or technology. Presently, John is a professional development specialist and program leader in the Adult Numeracy Projects program at TERC, based in Cambridge, Massachusetts.

John A. Benner has an M.A. in chemistry from The University of Texas at Austin. He has worked as an analytical chemist, a science editor and content consultant, and a freelance writer. His past projects include chemistry, physics, and physical science textbooks for Holt, Rinehart and Winston and several titles in the True Books series for Children's Press. John's work for CK-12 is his first contribution to open-access publishing. He currently works as a computer programmer in Austin, Texas.

David Bethel has been a lifelong student of science, mathematics, and philosophy. He completed the "Great Books" program at St. John's College in Santa Fe, NM, in 1995. He has also studied physics, astronomy, biology, math, and the history and philosophy of science at Brown University and the University of Texas at Austin.

Dr. Bewick received her B.Sc. in Chemistry from Mount Allison University. She then went on to complete a Ph.D. at Princeton University where she studied the electronic properties of organic crystals. Currently, Dr. Bewick is at the University of Tennessee where she hopes to use game theoretical models to learn more about how immune systems fight off viruses and bacteria.

Jennifer Blanchette is a science writer and researcher. Her research is focused on the role of fatty acids in the development of the model organism, C. elegans. She earned her B.A. in biology from Oberlin College in 1994 and received a doctorate in biological chemistry from the University of Michigan in 2004.

Dr. Jean M. Brainard is a freelance health and science writer and curriculum specialist living in central Ohio. She received a master's degree from the Harvard School of Public Health and a doctorate in biomedical anthropology from the State University of New York at Binghamton. A former university professor, Dr. Brainard has written hundreds of textbook chapters and encyclopedia articles on a diversity of subjects, as well as numerous professional publications based on her own research.

Sarah Brockett has worked in educational publishing for seven years. After receiving her BA in English Literature from the University of Pennsylvania, she began her editorial career at Pearson Education. She left to pursue work as a freelance writer and editor, and has since participated in projects for all ages and in all disciplines. These include revising the curriculum for Philadelphia public schools, writing AP test guides, contributing encyclopedia entries, and producing various state-oriented math books. She recently earned her Master's Degree in U.S. History from American University in Washington, DC.

I originally studied physical therapy at Quinnipiac University, but discovered that education was a more apposite career. In 2001, I received a BS in Health and Science Studies, with minors in mathematics and biology; and in 2004 I completed an MA in Mathematics for Teachers at Western New England College. I have taught high school and middle school mathematics for seven years in Massachusetts and Colorado. And most recently, I have worked as an Educational Specialist for an education technology company. I am passionate about mathematics and science education, and I believe that instruction in these areas should foster creative thinking, problem solving, innovation, and ingenuity.

Mary Cavanagh is Executive Director of Center for Practice, Research and Innovation in Mathematics Education (PRIME Center) at Arizona State University. She is the author/co-author of K-8 five mathematics textbook series, teachers' editions, handbooks, resource books, ancillaries, monographs, and articles in math, science and language arts. She has taught all of the elementary grades as a classroom teacher and mathematics specialist, developed curriculum and has conducted professional development programs throughout the United States and Germany.

Victor Cifarelli (Ph.D., Mathematics Education, Purdue University) is an Associate Professor of Mathematics and the Coordinator of the Mathematics Education Program in the Department of Mathematics at the University of North Carolina at Charlotte. His doctoral research focused on the role of reflective abstraction as a learning process in mathematical problem solving. His current research examines how solvers reflect on and test the viability of their evolving intuitions, and transform their initial hypotheses and conjectures into actual solution activity. Dr. Cifarelli has presented his research at AERA, PME, and PME-NA. His articles have appeared in the Journal of Mathematical Behavior, Focus on Learning Problems in Mathematics and the Proceedings of PME and PME-NA. Over the past several years, he has been an active contributor to SIG/RME as a reviewer and presenter of research papers. In addition to his research interests, Dr. Cifarelli has demonstrated an on-going commitment to the professional development of mathematics teachers. He has taught a variety of undergraduate and graduate mathematics and mathematics education courses including mathematics for elementary education majors, mathematics education for elementary and middle school education majors, and graduate mathematics courses for secondary mathematics teachers. He has co-directed a pair of projects for elementary, middle, and secondary grades mathematics teachers under the Eisenhower Professional Development Program and also has conducted numerous in-service workshops for middle grades and secondary mathematics teachers.

Mark Clemente received his undergraduate degree in chemistry from the University of Pennsylvania in 1986 and his Master's degree in Education from old Dominion University in 1996. He is a National Board of Professional Teaching Standards Certified Teacher and is currently an Educator-in-Residence at the National Institute of Aerospace (NIA), “on loan” from Virginia Beach City Public Schools. Mark has 11 years of experience teaching chemistry in Virginia Beach. During that time, he has written and reviewed science curriculum, served as a Science Department Chair at his school, conducted many professional development workshops for teachers in the school district, and served as an adjunct instructor for Virginia Wesleyan College’s School of Education. As an Educator-in-Residence, Mark is currently coordinating a Modeling and Simulation Demonstration School project. The purpose of this project is to use modeling and simulation as an instructional strategy within mathematics and science instruction and to demonstrate ways to integrate mathematics and science instruction through the use of models and simulations.

Shonna Crisden Robinson has a B.S. in Chemistry and Japanese and an M.S. in Secondary Education. She has taught Eighth Grade Physical Science, Seventh Grade Mathematics, College Chemistry for Nurses, Basic College Mathematics, and High School Chemistry, Earth Science, Physics and Biology. Shonna has written, edited, and reviewed a variety of educational materials including chemistry and physics problem manuals, standardized test preparation materials, web-based mathematics lessons and instructor’s guides, and Physical Science Teacher’s Editions.

Don Cummings received his Ph.D. in English in 1965 from the University of Washington. He taught English at Central Washington University in Ellensburg, Washington from 1960 until 1996, when he retired as Professor Emeritus of English. For about twenty-five years he directed and was the principal instructor in Central's Academic Skills Center, where college students were taught developmental writing, spelling, reading, and mathematics He also served for seven years as chairman of the English Department and later as Dean of the College of Letters, Arts, and Sciences. In 1970 he started writing The Basic Speller, an inductive approach to English spelling for younger students, working with third and fourth graders in the Seattle area. In 1988 the Johns Hopkins University Press published his monograph American English Spelling. In 2003 he established dwcummings.com, a website for spellers, teachers of spelling and reading, and other students of English words. For the last thirty-five years his primary scholarly interest has been English spelling - its system and logic, its history, and how best to teach it to younger and older students. After several decades of frustration with conventional publishers, so reluctant to deal with new approaches that cannot promise a fat bottom line, he's very interested in and enthusiastic about open-access and collaborative publishing.

Angela Cutshaw is a physics teacher in Newport News, VA. She earned her bachelors in mathematics from Shenandoah University in 2003 and her masters in physics from the College of William and Mary in 2005. She is originally from Winchester, VA, and misses the mountains and the Shenandoah Valley very much.

I graduated in physics and mathematics from Carnegie Mellon U; MA from UCLA; secondary credential from SF State. I worked as an electronic engineer and ship-board radar technician in Seattle, and as a teacher for 22 years in high schools in Hayward and Sacramento. Courses I have taught include physics (AP also), chemistry (AP also), astronomy, calculus, algebra II, precalculus and integrated science. I was a Scimat fellow in Florence (1992), a Department Chair for both science and math, and taught physics lab sections for UC Davis. I am presently a faculty member at Chapman College (teaching prospective teachers for math and science) and a consultant for the Natomas USD. I wrote a number of original labs which have been shared, as well as designed new courses in science and math, now used by teachers at several schools. I co-authored People's Physics Book, an open-access book, available through the UCSC Institute of Particle Physics and CK-12. I am committed to the idea of collaborative work in science/math texts and lab books.

James H. Dann was born and raised in San Francisco. He attended Lowell High School and went on to UC Santa Barbara where he received a B.S. in physics. James then went to grad school at UC Santa Cruz where he joined Alan Litke's research group at CERN, the largest particle physics lab in the world. James worked at CERN, in Switzerland, for 4 years where his research earned him a Ph.D. in particle physics. James then moved back to San Francisco and lived with his oldest son Aaron, while teaching high school in the city. After seven wonderful years teaching high school, James went on to work as a Senior Engineer for GMW in Silicon Valley. James has since returned to his true passion of teaching high school at Menlo School and lives with his wife, Nisha, and second son, Ashaan, in the Bay Area.

Bruce Davidson has a M.S. in Physical Science Education from Old Dominion University. He has retired after teaching high school physics and biology and is currently working part-time for Newport News Public Schools in Newport News, Virginia. He currently works with new as well as experienced science teachers integrating technology and the hands-on experience into classroom instruction. He also provides professional development to science teachers using handheld data collectors to enhance students’ experimental experience. Outside of the classroom you will find him kayaking, biking and hiking. He currently lives with his wife and son (17 years) in Newport News, VA.

Dana Desonie's set of eight books on environmental issues entitled "Our Fragile Planet" has just been released by Chelsea House. Booklist named "Oceans: How We Use the Seas" as one of the top ten environmental books for youth for 2007! Besides environmental science, Dana also writes and edits in the fields of geology, oceanography, and biology. With a doctorate in oceanography and a trip to the bottom of the ocean in the research submersible Alvin under her belt, she now lives in the Sonoran Desert with her neuroscientist husband and their two children.

Jonathan Edge currently teaches chemistry and physics at Arleta High School. He has been a teacher with the Los Angeles Unified School District for 9 years, and has previously worked as an environmental chemist. He is a 1984 graduate of Whittier College, and in his spare time enjoys bicycling and building model airplanes.

Kenny Felder is a math and Physics teacher at Raleigh Charter High School. He maintains a Web page with explanations of math and physics topics at http://www.ncsu.edu/felder-public/kenny.

Mike Fetsko is currently a physics teacher at Godwin High School in Richmond, Virginia. He received his BS in Multiple Science from LeMoyne College and a MST in Physics from the State University of New York at Plattsburgh. He has been teaching all levels of high school physics since 1993 and he is always looking at ways to incorporate innovative ideas and content into his curriculum.

Dr. Carol Findell is a Visiting Scholar at Arizona State University until May 2009, and then returns to Boston University as Associate Professor of mathematics education. Her focus is on problem solving, mathematics for special needs students, and making connections between college-level mathematics and the elementary, middle, and high school mathematics curriculum. She was author or co-author of national middle school Mathcounts competition questions and of many math books for students in grades PreK-7.

I am currently a programs consultant for High School in Nova Scotia but spent ten years teaching chemistry. I spend most of my time in-servicing teachers in the pedagogy surrounding science and math teaching and taking care of my two beautiful boys.

Thirty-one years teaching mathematics and physics - mostly at high school level but also at community college and university level. Currently teaching mathematics at Southern Oregon University. Created and led workshops for mathematics and physics teachers and wrote a manual for the American Association of Physics Teacher- The Role of Mathematics in the Teaching of Physics. Was a member of a team of teachers who developed the Comprehensive Conceptual Curriculum for Physics DVD, funded by NSF.

Craig Freudenrich, Ph.D., is a freelance science writer. He earned a B.A. in biology from West Virginia University and a Ph.D. in physiology from the University of Pittsburgh School of Medicine. He has over 25 years experience in biomedical research, science education, and science writing.

Tirupalavanam G. Ganesh is an Assistant Dean for Information Systems in the Mary Lou Fulton College of Education at Arizona State University. He has bachelors and masters degrees in computer science and engineering and a PhD in interdisciplinary studies. He is the recipient of an NSF award from the Information Technology Experiences for Students and Teachers (ITEST). His research interests include STEM education; exploring and harnessing the potential offered by emerging technologies in the communication of research; use of graphical data analysis techniques with large-scale data sets; and the use of visual data in educational research.

Andrew John Gloag was born in the North East of England and graduated from Oxford University in 1992 with a Bachelors degree in Physics. He obtained his PhD from Strathclyde University, Scotland in 1996 and worked in fiber-optics research until he moved to San Diego, California in 1999. He currently teaches physics and mathematics at High Tech High School in San Diego.

Anne Marie Gloag was born in Bucharest, Romania and moved to the US when she was 14. She graduated Old Dominion University with a major in applied mathematics and obtained a PhD in applied mathematics from Northwestern University in 1996. After working in the UK for 2 years, she moved to San Diego, California. She has been teaching mathematics and chemistry at High Tech High for 7 years.

Niamh Gray-Wilson is a freelance science writer and editor living in Austin, Texas. She hails from Galway, Ireland, and graduated from the National University of Ireland, Galway with a bachelor's degree in microbiology.

Randy Green is a freelance editor and writer of mathematics textbooks and ancillaries. She has a Bachelor of Arts in Mathematics from the State University of New York at Albany and a Master of Science in Education from Queens College. Randy started her editorial career at Holt, Rinehart, and Winston. She taught high school math before returning to a career as a freelance editor/writer. She specializes in editing and writing math books for grades 4 through 8.

Dan Greenberg is author of 20 books for Scholastic Professional Books including Fabulous Fractions and Comic Strip Math, both of which have sold over 75,000 copies. Dan is currently working on True Tales of Deep Irony and Petty Vindication, a cartoon series that he hopes to turn into a book.

Carole Greenes is Associate Vice Provost for Science, Technology, Engineering and Mathematics (STEM) Initiatives at Arizona State University, Professor of Mathematics Education, and Director of the Practice, Research and Innovation in Mathematics Center. Greenes is author of more than 70 articles and 300 programs and books in mathematics, three mathematical musical mysteries and one musical history of mathematics. Greenes is Principal Investigator of the NSF-funded, Prime the Pipeline Project: Putting Knowledge to Work.

Jessica Harwood is a freelance writer and a Professor of Biology at Spartanburg Methodist College. She earned a B.A. in biology from Ohio Wesleyan University, a M.S. in botany from the University of Wisconsin-Madison, and a M.A. in professional communication from Clemson University.

Andrea is a graduate of Western Michigan University and Marygrove College. She currently teaches high school math and English at Maple Valley High School in Vermontville, MI. She also teaches online math courses for Michigan Virtual School and Axia College. She resides in Grand Ledge, MI, with her husband and son.

After completing her degree in Music Education, Kathryn taught high school choir for one year, spent three years splitting her time between music and technology, and was ultimately lured fulltime to the field of Educational Technology as it took off in the late 1980s. She worked as the Technology Integration Specialist at the Nueva School in the San Francisco Bay Area for from 1989 to 2007 and concurrently taught in the Teaching Credential Programs at San Francisco State University and UC Berkeley. She recently left the non-profit world and now works as Education Outreach Manager at Luidia Inc., an Interactive Whiteboard Manufacturer, in San Carlos, CA. She enjoys traveling and hiking and still finds time to sing with friends.

Andy Jackson teaches physics and astronomy at Harrisonburg High School in Harrisonburg, Virginia. He teaches half-time, is the K-12 science coordinator for Harrisonburg City Public Schools, and part-time physics lab instructor at James Madison University. Andy received his BS in Physics from JMU in 1987 and has been teaching various levels of physics since. Andy has been an active member of the Virginia Instructors of Physics since its inception and served as president from 1998-2006. He is a life member of the Virginia Association of Science Teachers (VAST) and has served VAST as Physics Chair, PDI chair, and was President of VAST in 2008.

Louise Jarvis graduated from Mary Washington College (now University of Mary Washington) in 1987 with a double major of Mathematics and Sociology. She earned her MS in mathematics from the University of Rhode Island in 1989. She taught college-level math classes for 10 years and has worked with all levels of mathematics. She has been a writer for the math educational industry for several years. She also home educates her children in all subjects.

I have always had an affinity for math. After graduating from UCLA with a BS in Mathematics and M.Ed. in Mathematics Education, I decided that I wanted to teach. I began teaching in Los Angeles and shortly thereafter I moved to Washington DC with my husband. I continued to teach high school in Falls Church, VA for 4 years. After that, my husband and I decided we wanted to be back in California and we moved to where we currently reside, Santa Barbara. I taught for one year here and towards the end of the 2006-2007 school year, I became pregnant with our daughter. After her birth, we decided that I would stay home with our daughter. I am excited to be a part of the CK-12 team, considering that it affords me to stay home with my daughter and stay close to education.

Tapas Kar is an Assistant Professor with the Department of Chemistry & Biochemistry at Utah State University (USU). Prior to working at USU he taught and did research at Southern Illinois University Carbondale (SIUC). Kar focuses his research and teaching in the area of nanoscience and nanotechnolgy. He introduced nanotechnology courses at USU and currently teaches nanochemistry courses.

Jen Kershaw has a B.A. in Theater from the University of South Florida and a Masters of Science in Education from Wheelock College in Boston, Massachusetts. A Wheelock graduate of the Teaching Students with Special Needs program, Ms. Kershaw began her teaching in residential programs with emotionally disturbed adolescents. It was there that she fell in love with mathematics and made it her mission to become an innovative, creative math teacher. She received an Excellence in Education Award in 1999 for mathematics and has nine years of classroom teaching experience, six of which are in the area of middle school mathematics. Ms. Kershaw recently published her first entire curriculum unit titled, “The Great Equation Race” with Interact, Inc. Today, Jen works as a freelance curriculum writer and specialist designing and publishing math curriculum for students and teachers.

Melissa Kramer is a mathematics teacher for Laingsburg High School located in Laingsburg, Michigan. She earned an undergraduate degree in Secondary Mathematics Education (Eastern Michigan Universtity) and a master degree in Educational Administration (University of Michigan). Her current endeavor is to earn her certification to teach secondary English. In addition to her role as an educator, she has the accomplishment of leading her mathematics department, school improvement team, attendance appeal board, and numerous other committees. Melissa's spare time is spent reading, gardening, hiking, and enjoying nature. Her most favorite pasttime is spending time with her husband, kindergarten son, and two cats

Dr. Kraus received her Ph.D. in zoology from Rutgers University. For over 20 years she has been a freelance science and medical writer and editor, for both technical and lay audiences. Dr. Kraus has contributed to several books, has written for a variety of media including educational publishing, newspapers and radio, and has consulted for public television. She received an American Medical Writers Association award for a newspaper series on Alzheimers Disease.

Stephen Krause is a full professor at Arizona State University, where he teaches courses in polymer science, materials characterization, and capstone design. He has conducted research in engineering education at the undergraduate level and K-12 outreach. He co-advises students from education, chemistry, physics, and math on National Science Foundation projects on Engineering Education and Project Pathways. He is currently developing tools to assess knowledge, skills and self-confidence in math, science, and engineering for high school students. Overall, he is working at the local and national level to broaden participation in engineering and design to all students in K-12 with particular emphasis on females and minorities.

Mara Landers holds a B.A. in mathematics from Swarthmore College, and an M.A. and PhD in mathematics education from the University of California, Berkeley. Dr. Landers has worked as a mathematics educator since 1997, including teaching, tutoring, educational research, and curriculum and assessment development. Dr. Landers is currently an assistant professor of mathematics at Los Medanos College in Pittsburg, CA.

Ellen recently moved to Berkeley, California from Brussels, Belgium. There, she worked at the International School of Brussels as Head of the High School and as a teacher of AP Statistics and IB Math Standard Level. She has also taught high school mathematics at Sandy Spring Friends School and at Sidwell Friends School in Washington, D.C. At the college level, Ellen has taught statistics at California State University Sacramento and at George Washington University in Washington, D.C. In addition, she has worked as a mathematical statistician for the Internal Revenue Service. Ellen has a Master’s degree in mathematical statistics from the University of California at Davis and all but a dissertation (ABD) in mathematical statistics from George Washington University in Washington, DC. She is currently an IB Examiner for Mathematics Standard Level.

Rob Lucas is a Ph.D. student at Stanford University School of Education, where he studies educational technology, curriculum, and history education. Previously, he taught 6th grade social studies in Rocky Mount, NC. He holds a B.A. in Social Studies and an M.Ed. in Technology, Innovation, and Education from Harvard University.

Mary Lusk is an Environmental Science instructor at Southwest Florida College in Tampa, Florida. She also works as a freelance science education writer and especially enjoys writing about Earth Science. She has college degrees in Geology and Soil Science, and in her free time she likes collect rocks and minerals, garden, and spend time with her husband and 3 little boys.

I am Brenda Meery and I am a high school mathematics teacher in Glace Bay, Nova Scotia. I have been teaching for thirty-three years and have been involved in the implementation of math courses at the high school level. In addition to this involvement, I have been a presenter at many provincial training sessions for math teachers. While teaching full time, I managed to raise four daughters who have since left the nest and are successful in their chosen fields. Teaching has been a diverse yet rewarding experience and a career that I would recommend.

Brianne Megerdichian earned her teaching credential from California State University, Northridge in 2001. Brianne is currently working as a K-8 science teacher in San Diego, but has also taught middle school math and 5th grade. She has spent most of her teaching career working with second language learners and students with special needs. Brianne believes that a good curriculum is challenging, hands-on, has ties to the real world, and meets the needs of a diverse population of learners. In addition to writing for ck12.org, Brianne has also written for Kaplan, Inc.

Darryl Morrell received his B.S., M.S., and Ph.D. degrees in Electrical Engineering in 1984, 1986, and 1988 from Brigham Young University. He is currently an associate professor of engineering at Arizona State University, where he is participating in the design and implementation of a multi-disciplinary undergraduate engineering program using innovative, research-based pedagogical and curricular approaches. He has been actively involved in the development of open educational resources and has authored modules with the Connexions project (an open source curriculum authoring system). His technical research interests include stochastic decision theory applied to sensor scheduling and information fusion, and, more recently, application of research based pedagogy to engineering education.

Benjamin Moynihan studied at Dartmouth, the Conservatoire National De Musique in Dakar, Senegal, and the Harvard University Graduate School of Education. He seeks to build alliances across multiracial and multigenerational boundaries through education, and developed the African Drums & Ratios Curriculum with Robert P. Moses, John Belcher and a team at the Algebra Project. This is the first in a series of Algebra Project modules to be shared on the CK-12 web site.

Ramesh is a teacher and educational technology developer for high school and college level mathematics. His current focus is on developing courses, software and interactive lessons which relate mathematics to topics in history, biology, social and environmental justice, the arts and international affairs for universities, educational organizations and distance learners. You can learn more about his educational projects at www.brainstormacademy.com Ramesh holds an MS in Applied Mathematics from the University of Washington, an MS in Electrical Engineering from the Georgia Institute of Technology, both of which emphasized modelling complex biological systems in the brain and the ecosystem, and using software to teach mathematics. He received a BA in Engineering Sciences at Dartmouth College, where he focused on robotics and control theory. If Ramesh could be anywhere right now, it would be in the mountains thinking about math (and taking pictures).

Colleen O'Donnell Oppenzato has worked in the field of educational publishing since 1999, developing mathematics curricula for grades 2-11. Before that, Colleen participated in Teach for America and worked as a teacher of exceptional children at the middle school level. She has also worked as a fifth-grade teacher. She is currently completing a master's degree in Cognitive Studies in Education at Teachers College, Columbia University.

John S. Ochab, Jr., Ph.D. was born in a suburb of Boston, MA. He attended the University of Massachusetts (at Boston) and obtained a B.A. in Biology. He worked as a biochemiocal laboratory technician for 3 years (with journal acknowledgements) and as a toxicologist for one year. He then decided to go into physics. After taking courses in advanced mathematics and physics (at M.I.T. and at Boston University), he entered graduate school at Clark University, (Worcester, MA) where he obtained a M.A. in physics (nuclear solid state). He then entered the University of Maine (at Orono) were he obtained a Ph.D. in experimental surface physics. Upon graduation, he worked in the industry for companies as Spectra Physics, GTE Sylvania, as well as smaller companies. He also did research in high temperature superconducting thin films at Brookhaven National Laboratory in Long Island, NY. Due to financial crisis of the late 1980’s, he moved to California where he trained process engineers in semiconductor metrology and taught physics part-time at local community colleges. John then moved to West Virginia and taught physics, physical and engineering physics, and after getting married, moved with his wife to Virginia. He has been teaching algebra and calculus-based physics at J. Sargeant Reynolds Community college ever since. He has first-author publications in Journal of Surface Science, and co-authored publications in Physical Review Letters, Journal of Applied Physics, and Physicsa C. He is a member of the American Association at of Physics Teachers, the Virginia Academy of Science, and was a long-standing member of the American Institute of Physics.

Erik Ong is from the San Francisco Bay Area.  He has worked in San Ysidro Middle School on the California-Mexico border for ten years as a school counselor and a teacher of algebra and science.  He believes in giving all students access to the teaching standards while building vital social skills as well.  He was selected as Teacher of the Year for the San Ysidro School District during the 2007-2008 school year.

Richard Parsons graduated from San Jose State University in 1967 with a BA in Physical Science with a Chemistry Option and received his MA in 1968 with the same major. He taught high school honors Chemistry, Physics, and Advanced Placement Chemistry for 35 years and was the Science Department chairman for 25 years in the Santa Clara Unified School District. Mr. Parsons retired in 2000, but continued to teach Advanced Placement Chemistry part-time for another 5 years. In the early 80s, he co-authored an in-district course (text, lab book, teacher's guide) in Integrated Science. The course was taught in all district high schools for 15 years. Mr. Parsons became an author for CK-12 in June 2008 and now serves as CK-12's Chemistry domain expert.

Jared Prolo has used both his Music Education and Math degree from Loyola University New Orleans for teaching all levels, from Kindergarten music classes in New Orleans to Calculus at UC Santa Cruz. His major instruments are bassoon and saxophone, and he is a mountain bike team coach as well as a road and track cycling racer. Jared believes the best lessons always happen outside the constraints of the classroom and wants his students to create, build, measure, destroy and experience creations to learn math and science.

Chell Roberts is the Chair of a new multidisciplinary engineering program at Arizona State University's Polytechnic campus. He received a PhD in industrial engineering from Virginia Tech, a master's degree in industrial engineering from the University of Utah and a bachelor's degree in mathematics from the University of Utah. Dr. Roberts has published over 70 technical articles, participated in over $2 million dollars of research, provided consulting services to many companies, and served on many national conference organization committees, national review boards, and technical committees. Dr. Roberts's primary research and teaching interests are in the area of manufacturing automation, computer simulation, and engineering education.

Kurt Rosenkrantz is a curriculum specialist at a website specializing in interactive science and math simulations. He spent eight years teaching middle school and high school science in California and New York. He has a bachelor's degree in Earth Science from Harvard and a master's degree in Geology from the University of Cincinnati (specializing in invertebrate paleontology). He grew up in Vermont and currently resides in Chapel Hill, North Carolina.

Julie Sandeen is CK-12's Domain Expert for Earth Science and author of several chapters within the FlexBook. She is currently a high school teacher at Woodstock Academy in Connecticut and Adjunct Faculty at Eastern Connecticut State University. She is passionate about Earth Science and loves sharing that joy with her students. She received her Master's degree in Geology from the University of Connecticut and did her undergraduate work at Smith College in Northampton, Massachusetts.

Jim taught secondary math from the East Coast to Hawaii and back to West Virginia. He worked with teachers and students from kindergarten through high school as a math/science specialist. Jim also spent several years creating and managing statewide math testing programs. Along the way Jim published many articles in math and science teacher journals, and he edited secondary math textbooks. Jim has a special interest in hands-on and project-based math learning.

Helen Scully was born in 1977 and received her degree from Brown University. She has long been committed to creating quality, imaginative education content. Her novel, In the Hope of Rising Again, was published in 2004.

Dr. David A. Slykhuis is chair of the Physics/Physical Science Academy. Dr. Slykhuis has been at James Madison University since the fall of 2004. His primary responsibilities lie in the preparation of science teachers in the middle and secondary education program. His research interest involves the use of technology in K-16 science classrooms to increase student achievement. Dr. Slykhuis received his PhD in Science Education from North Carolina State University in May of 2004. He has five years of high school classroom experience, teaching primarily chemistry and physics.

Dr. Stern received his M.Sc. in physics from the Hebrew University in Jerusalem, his doctorate from the Israel Institute of Technology, and retired after 40 years of research with NASA Goddard SFC on the Earth's magnetosphere. He has produced extensive education resources on the Web, including "From Stargazers to Starships." He has also written space-related history, poems and a middle-school mathematics enrichment text "Math Squared."

Phil Tschirhart was a chemistry teacher in suburban Maryland for twenty- one years: eighteen years at Oxon Hill High School and three years at Leonardtown High School. He was selected to the Who’s Who of American Teachers four times. Phil graduated with a B.S. in chemistry teaching from Michigan State University, and currently lives as a gentleman farmer outside of Durham, North Carolina with his wife.

Sean Walker is currently finishing his last few years of a PhD program in Computer Science at Stanford University. Sean taught the introductory Computer Graphics class at Stanford for two summers, TA'd more times than he would have liked, and currently moonlights as an SAT instructor and tutor for one of the major SAT prep companies.

Janel White-Taylor is assistant professor at Arizona State University. In addition to teaching, she directs the Project eXcellence Program, which provides high-quality out-of-school learning environments for underserved K-12 students. The project assists both preservice and in-service teachers by offering site-based courses and unique field experiences. White-Taylor's research interests include innovative strategies to integrate technology into the classroom, using technology as a tool to increase student achievement and retention, and the effects of technology-infused, out-of-school programs.

Douglas Wilkin, Ph.D. is currently the Chair, Department of Science at Arleta High School in the Los Angeles Unified School District. Prior to teaching high school, Dr. Wilkin held a number of faculty positions at leading research institutions throughout the United States, including the National Human Genome Research Institute of the National Institutes of Health, Cedars-Sinai Medical Center in Los Angeles, and the Federal Bureau of Investigations in Quantico, Virginia. He is extensively published.

I am currently a doctoral candidate in mathematics education at the University of California, Santa Cruz. My research focuses on the ways students learn algebra through peer discussions, and the interactions between learning mathematics and learning language, with a special emphasis on understanding the mathematics learning of Latino English Learners. Prior to my exciting life as a graduate student, I taught high school math for six years--three years at Bellarmine College Preparatory in San Jose, and three years at Saramen Chuuk Academy in Chuuk, Federated States of Micronesia. While teaching in Chuuk, I first encountered the problem of finding appropriate and affordable texts for my students--and at that time I took the "do it yourself" approach and wrote an entire book based on my class notes. One of my hopes is that our CK12 books can be a resource for schools like the one I taught at in Chuuk. As an undergraduate I studied mathematics and computer science at Boston College, and I also worked with Jerry Keough and C.K. Cheung on the development of several texts for introducing Mathematica and Maple, and doing calculus with Mathematica. Beyond the world of mathematics texts, I am an avid cyclist, and an Oakland A's fan.

Teresa Zwack received her BA from the University of California, Santa Cruz in 1999 majoring in Mathematics and with a minor in Earth Science. She taught high school and junior high math for many years, specializing in Geometry, Probability, and Statistics. In 2008 she completed her MS in Applied Mathematics at California State University, East Bay, and extended her experience by teaching at the University. She is excited to have the opportunity to share what she has learned in the classroom with other teachers.